Hi Tobias,
I've stopped using spamhaus.org when they started blocking 127.0.0.1
Didn't notice this and currently it is not listed.
Do you have any 'evidence' (or references) ;-) (Mailing-list postings, etc)
(what a very nice idea if you have a system that sends logs... very clever).
IMO this is your own fault because our MTA is configured incorrectly.
When using a RBL, your MTA must only check the RBL if...
#1 ..the peer is not allowed to relay based on $trusted_ips #2 ..did also not dare to authenticate itself using SMTP-Auth #3 ..would like send mail to $your_destination
Spamming RBLs with queries about internal IPs is not nice.
Example for postfix: smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_rbl_client foo.example.com, reject_unauth_destination
Regards, Adrian